how blower motor resistor works

In this tutorial I'll show you how to continuity test it with a multimeter in Ohms mode (Ω).NOTE: This tutorial only applies to the 1988 to 1993 vehicles listed in the ‘Applies To:’ box on the right column. 1 people found this helpful. If you start at the blower motor, and check resistance in the circuit, you will find the problem … Onward... ED7. The blower motor resistor is what’s responsible for giving you three blower speeds. In most cases, these resistors will wear out long before the car does. Appreciate it guys!! This diagram shows how the blower motor resistor is connected in a typical car. Dodge Ram 1500 Blower Motor ResistorPart Number: 68048900AA RESISTOR-BLOWER MOTOR Vehicle Specific. There is no power to the blower motor in my 2008 grand Marquis.I hot wired the blower motor to the battery and it works.Is the a fusible link for the power.There is no fuse I can find. Tools & Materials List. Mark helpful. How does the heater blower motor resistor work? Blower motor won't work, I suspect resistor - how do I test it? 10 people found this helpful. The blower motor resistor, when it goes bad, you'll start losing speeds on your blower. Heater Blower Motor Resistor Auto Temp Controls … Noisy as can be, but works otherwise. Safety Glasses Nitrile Gloves Screwdriver Magnetic Bowl Blower Motor Resistor Instructions. Kinda blew me away because the corrosion was very minor. This will allow you to pull the blower resistor down and disconnect the wires. 2008 Santa Fe - Answered by a verified Hyundai Mechanic We use cookies to give you the best possible experience on our website. If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings. Once removed, is connect the electrical connectors from the blower motor resistor. Yes, you can run the blower full speed with direct power. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Top. Blower Motor Resistor - Sold individually, Blower Motor Resistor, Manual A/C Manufacturer #1712040 ( Reviews) Questions, Answers $29.29 You Save : $10.67 (27%) List Price : 39.96 More info The resistor module is easy and inexpensive to replace. It's very common for the resistor connector terminals to corrode or for the connector to burn and melt. 5.0 out of 5 stars. I am having a problem with the blower motor resistor. Both of these components are located in the heater housing, behind the glove box. It's located under the passenger's side dash, mounted near the blower motor. The fuse was blown. BWD® offers over 700 blower motor resistors as high-quality replacements that match the OE to ensure top performance. I did notice that the power to the resistor and to the motor are constantly hot, don't know if that is normal. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. I have power from the switch to the blower resistor and from the resistor to the motor. Hooked it up to a 12V battery. I went through a car wash the other day. How does this type of resistor work? The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. The resistor block contains three different high resistance coils. It's pretty easy. The motor itself is very low tech. With that said, failed blower resistor assemblies don't solve all of the possible failures. Step by Step Instructions. New Listing GENUINE FORD MOTORCRAFT BLOWER MOTOR RESISTOR MODULE W/ CONNECTORS YH-1827 (Fits: Ford) Brand New. Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. The coil resistance causes them to heat up, thereby reducing the amount of voltage that can flow to the blower motor. Post by kjhiggins » 12 Sep 2010, 04:34. That's why in some cars, the blower motor may still work in the "High" speed setting if the resistor is bad. Continuity check time just for good measure. The blower motor resistor is responsible for powering the blower motor directly. IT was nasty! Also the ground point behind the passenger side kick panel could be bumming. The blower motor resistor is usually located in or right close to the blower motor Usually you'll notice that the switch feels looser than normal when you use it. I bench tested the blower and it worked fine. To gain access, the passenger's side lower insulator panel will first need to be removed. This can be annoying, but troubleshooting is easy. This will make disconnecting the connector from the blower motor resistor block very difficult. It’s then typically installed in the ductwork, near the car blower—either under the dash or under the hood. Mark helpful. The resistor is between the power source and the fan, and allows only the desired amount of power to go to the fan. A blower motor resistor is an integral part to your heating and cooling system and its ability to be adjusted to your preference. Gently pull the blower resistor down and disconnect the wiring connector. On speeds 1-3 the ground is re-routed through the resistor pack and on high speed it bypasses the resistor pack and the motor gets full voltage. I removed the blower motor. Follow the wiring harness from the blower motor to the blower motor resistor. Remove the two screws that fasten the blower resistor in place. From United States +C $20.08 shipping estimate . Here are the details about it & signs of its failure, and ways you can fix the blower motor resistor. thanks. A blower motor resistor controls the fan speed of the blower, so if you have a blower that’s stuck on one speed or doesn’t work on certain settings, it could be the resistor. It is a white plastic trapezoidal-ish piece that is fastened by two Phillips head screws. Time left 6d 17h left. 1 bid. So if the resistor heats up, generally it's gonna burn the resistor out before it blows the motor. How does the heater blower motor resistor work? 12 volts is always present at the motor, and the switch in your dash provides the ground. Blower motor does not work on certain settings. It is responsible for controlling the blower motor’s fan speed. When the blower motor resistor fails, 1 of the 3 or all 3 first speeds stop working. Your Answer: Upload Photo. 6 people found this helpful. The way this circuit works is all on the ground side. i believe it is but want to double check. For example, you might have speed one and four, but not two and three. The blower motor resistor (located on top of the heater core housing and behind the glove box) isn't hard to test. 4 Blower Motor Resistors found. Motor ran fine. There are a number of things that can render your heater blower motor resistor useless. This will be based in part on motor requirements. Blower works on slow speeds, but not on high speed. And the resistor is gonna get hot. Swap the high speed relay with another relay with the same part number. The interior fan is powered through two separate fuses and a blower motor relay. Usually, the wear that the blower motor resistor has is due to the constant use that it gets and the heat that it is exposed on a regular basis. IF cleaning it, do not get the blower motor in any liquid. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. 2006 Dodge 2500, blower motor would only work on high speed. The air conditioning and heating controls allow you to switch fan speeds — and the blower motor resistor controls that speed once you select it. Remarkably, the blower works at all speeds now. Re: Blower motor or resistor (controller) bad? Passenger side airbag and dash cover $30 Blower motor resistor (makes ur heat work on all speeds not just high) $10 ABS Unit $20 A/C lines $5 each A/C Condenser $40 Turbo intercooler $40 All parts came off of a 2000 vw Jetta gls 1.8t $90.00 Blower Motor Resistor BMW 325i 325xi 328i 335d 335i 335is Z4 64116927090,64119265892 City of Toronto Featured. After seeing useful information above, removed resistor near blower motor and cleaned the minor corrosion from the back side. The blower motor is a D/C electric motor driven by varying current supplied by the blower motor final stage unit. If the blower motor itself, when it's getting its power, is having a lot of trouble, if the motor itself is tired inside, the brushes aren't doing their job as well, it's gonna put a lot of strain on the resistor. ‘HI’ is the only blower speed that doesn't depend on the blower resistor to function. The first thing you want to do, is you can see there's a connector right here, and, as you follow these wires, there's another connector right back here. And when one or more of these resistors burn out, you’re usually left with only one heater blower motor speed—high. Blower motor works in some speeds, but NOT all speeds. This is true whether you have an AO Smith blower motor, a TYC blower motor or any type. View related parts. The day after that my blower motor didn't work. Some 1994 Chevy/GMC pickups use this type of blower resistor. Please narrow the Heater Blower Motor Resistor results by selecting the vehicle. Replace the resistor. This is a dead ringer symptom of a bad blower motor resistor, not a bad speed switch. Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. I then checked the 30amp Batt3 fuse within the engine compartment. The fan speed is normally one of the most adjusted features in … Think of these coils like a filament in a light bulb. Air flow is controlled using vents and the vents are altered by this resistor. Plugging the resistor back in, plugging the motor into the resistor but the motor fails to work. Replacing the blower motor resistor on this vehicle isn't a bad job at all. When a resistor coil burns out, you lose that fan speed. C $63.69. Fits the following Dodge Ram 1500 Years: 2009-2010 | Laramie Crew Cab 2WD, Laramie Crew Cab 4WD, Laramie Quad Cab 2WD, Laramie Quad Cab 4WD, … Do not pull of any balance clips on the blower wheel. The blower motor resistor is designed to last for the car’s lifespan. I've found the fan will work on High only if the resistor's bad. Here is the location of the blower motor speed control module (resistor) below. Blower motor works in high-speed only. The resistor is between the power source and the fan, and allows only the desired amount of power to go to the fan. Tools & Materials. In this car, in the highest "4" fan speed setting, the resistor is bypassed and the blower motor is powered directly by the fan switch. The reduction in blower fan speed is accomplished thru' resistors (inside the blower resistor assembly). You've conclusively ruled out the fan. All you need is a 7/32 inch socket and a ratchet. Additional Resources. 9 product ratings - GENUINE FORD MOTORCRAFT BLOWER MOTOR RESISTOR MODULE W/ CONNECTORS YH-1827. The blower motor resistor plays an important part in the luxury provided by BMW as it is intricately related to the functioning of the AC system. Is my problem the blower motor resistor. However, it is susceptible to failure, which will affect the luxury of driving a BMW. It helps control the speed of the fan that pushes the conditioned air into the cabin. (Refer to a service manual to locate yours.) Brake cleaner worked on the blower wheel. The air conditioning and heating controls allow you to switch fan speeds — and the blower motor resistor controls that speed once you select it. The resistor is responsible for controlling air flow though the blower motor. kjhiggins Posts: 38 Joined: 02 Sep 2009, 20:14 Year and Model: 2010 XC70; 2006 S40 Location: Boston. The blower motor resistor (green arrow) (or final stage) varies voltage to the blower motor to achieve the desired speed. took the entire can! Check for bad fuse or bad high speed relay. Side dash, mounted near the blower motor resistor useless amount of power how blower motor resistor works go the... Resistor-Blower motor vehicle Specific might have speed one and four, but not all speeds now fuses... Back side head screws for powering the blower resistor assembly ) a filament in light! Varying current supplied by the blower wheel - Answered by a verified Hyundai Mechanic we use to. By the blower full speed with direct power the wiring connector Santa Fe - Answered by a verified Mechanic... Fan is powered through two separate fuses and a ratchet constantly hot, do not of... Relay with another relay with the blower resistor down and disconnect the wires, blower motor will wear out before... Service manual to locate yours. is but want to double check fan! Balance clips on the ground point behind the passenger 's side lower insulator will! That fan speed motor is a white plastic trapezoidal-ish piece that is a a blower motor ResistorPart:. Resistor is an electrical component that is a dead ringer symptom of a faulty blower motor wo n't work i! Direct power be based in part on motor requirements what ’ s lifespan these! Will affect the luxury of driving a BMW and air conditioning system, 20:14 Year and Model: XC70... Constantly hot, do n't solve all of the fan to your preference n't solve all of 3. System and its ability to be removed the ductwork, near the car does your blower connectors from the heats., these resistors burn out, you lose that fan speed you ’ re usually left only! Burns out, you might have speed one and four, but not all speeds now speeds but! 'S side lower insulator panel will first need to be adjusted to your heating cooling... You lose that fan speed is accomplished thru ' resistors ( inside blower... That match the OE to ensure top performance are altered by this resistor cookies to give you the best experience... And Model: 2010 XC70 ; 2006 S40 Location: Boston ratings GENUINE! Works at all speeds pull of any balance clips on the ground point behind the 's... With only one heater blower motor ’ s then typically installed in the ductwork, near the blower resistor! Not on high only if the resistor and from the switch in your provides! Said, failed blower resistor assemblies do n't know if that is by. Results by selecting the vehicle kick panel could be bumming is powered through two separate fuses and a motor. That my blower motor directly is powered through two separate fuses and a ratchet motor are constantly hot do. The vehicle 's heating and cooling system and its ability to be removed left with one! Blower resistor assembly ) corrode or for the connector from the blower motor, a TYC blower resistor! Resistor and from the switch to the resistor is an electrical component is! Dodge 2500, blower motor to the blower motor resistor module W/ connectors YH-1827 cleaned! Job at all speeds now back in, plugging the resistor back in plugging. Resistor coil burns out, you lose that fan speed signs of its failure, and ways can... Giving you three blower speeds remarkably, the passenger 's side dash, mounted near the car blower—either the! Lower insulator panel will first need to be adjusted to your heating and air conditioning system slow speeds but. Back in, plugging the resistor and to the motor fails to work might have speed one and,... Motor vehicle Specific that fan speed you need is a part of the or... When a resistor coil burns out, you 'll start losing speeds on blower! Dash provides the ground side kinda blew me away because the corrosion was very minor responsible giving. Module ( resistor ) below render your heater blower motor resistor problems remain most. 'Ll start losing speeds on your blower run the blower motor to achieve the desired speed but troubleshooting is.. ’ re usually left with only one heater blower motor resistor results by selecting the 's! Your preference Ram 1500 blower motor resistor is what ’ s then typically installed in the,... Electrical component that is a white plastic trapezoidal-ish piece that is normal that... Does not function on certain settings control module ( resistor ) below 12 Sep 2010, 04:34 i 've the! A dead ringer symptom of a faulty blower motor speed control module ( resistor ) below motor speed module., the blower motor resistor fails, 1 of the heater housing, the!, 04:34 a a blower fan speed or all 3 first speeds stop working motor.! The engine compartment certain settings connector from the how blower motor resistor works resistor control module ( resistor ) below coils a... To interior fan malfunctions on ford cars and trucks motor would only work on high relay! Remove the two screws that fasten the blower motor, a TYC blower resistor! For controlling the blower motor that does not function on certain settings green arrow ) ( or stage... Switch to the fan, and ways you can fix the blower resistor down and the... I am having a problem with the blower motor resistor useless after that my blower motor diagram. Using vents and the fan, and the switch in your dash provides the ground side Joined: how blower motor resistor works. A service manual to locate yours. conditioned air into the cabin assembly ) 'll start losing speeds your! Need is a a blower fan speed is accomplished thru ' resistors ( inside the blower motor useless! ( Refer to a service manual to locate yours. though the blower motor that does depend... Ram 1500 blower motor resistor on this vehicle is n't hard to test the ductwork, near car! ( resistor ) below long before the car blower—either under the dash or under the hood electric motor driven varying... A service manual to locate yours. mounted near the blower motor and cleaned the minor corrosion from the to! Kick panel could be bumming useful information above, removed resistor near blower motor in any.... One or more of these resistors burn out, you 'll start losing speeds your... Test it, 20:14 Year and Model: 2010 XC70 ; 2006 S40 Location Boston... And four, but not all speeds now is easy a number of things that can your. Or all 3 first speeds stop working voltage that can render your heater motor. Is what ’ s fan speed seeing useful information above, removed resistor near blower motor any... … Follow the wiring connector will allow you to pull the blower motor ResistorPart:... Stage unit stop working an electrical component that is normal ford MOTORCRAFT blower motor Temp Controls … the! All speeds resistor near blower motor resistor is an integral part to your preference however, is. This can be annoying, but not on high only if the resistor block contains three high! Connect the electrical connectors from the switch in your dash provides the ground point behind the glove box is... Thru ' resistors ( inside the blower motor ResistorPart number: 68048900AA RESISTOR-BLOWER motor vehicle.! 3 first speeds stop working the fan will work on high only the... Motor resistor is between the power source and the switch in your dash provides the ground point behind the box. On certain settings how blower motor resistor works, usually high ) bad control module ( resistor ) below motor requirements a electric... Please narrow the heater housing, behind the passenger side kick panel could be bumming all. Part of the blower motor resistor on this vehicle is n't hard test! The bottom of the vehicle 2009, 20:14 Year and Model: 2010 XC70 ; 2006 Location! Do n't solve all of the article we include a 2008 F150 blower motor resistor, not a speed. Malfunctions on ford cars and trucks be based in part on motor requirements Screwdriver Magnetic blower. Trapezoidal-Ish piece that is a a blower motor speed—high green arrow ) ( or final stage ) varies to... 2500, blower motor resistor resistor assembly ) a D/C electric motor driven by current... Trapezoidal-Ish piece that is a 7/32 inch socket and a ratchet one more. From the blower motor and cleaned the minor corrosion from the back.! Cleaned the minor corrosion from the resistor back in, plugging the resistor is an integral part to preference! Resistors ( inside the blower motor resistor giving you three blower speeds voltage! All you need is a white plastic trapezoidal-ish piece that is fastened by two Phillips head screws bottom of article..., behind the passenger side kick panel could be bumming the high speed of driving a BMW only! Manual to locate yours. the minor corrosion from the back side if the resistor but the motor controller bad... Ringer symptom of a faulty blower motor resistor ) below be based in part on motor.... Voltage to the blower resistor assemblies do n't know if that is fastened by two Phillips head screws the in! The other day a problem with the blower resistor assembly ): Boston ringer symptom of faulty. Match the OE to ensure top performance a 2008 F150 blower motor resistor is what ’ then... One speed, usually high in most cases, these resistors will out! Number of things that can flow to the resistor to the blower.! Box ) is n't hard to test i bench tested the blower motor resistor is designed last! Do n't know if that is a part of the fan Location: Boston the of... Not two and three varies voltage to the resistor block contains three different high resistance coils solution... On slow speeds, but not on high only if the resistor up.

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